Will dwarf peas grow in a growbag?

[Hopefully]

I know I'll only get a few in, but I've got a spare growbag, and some spare seeds, and I'm contemplating introducing the two...

Or do they need lots of space for big deep roots, despite only growing to something like 30cm tall?

No they don't have much root, they should be fine, they need loads of water though, I would be tempted to start them in pots and then transfer them, but no doubt someone will come along in a minute and say that it's totally unnecessary, I like to make things hard for myself.

Ah, I'm a SAHM, I've got nothing better to do with my time than water plants

Might stick them in and see what happens. I'm not spending money on any more seeds, so seems silly to leave the growbag empty!